<template>

  <div class="app-component">
    <!-- 顶部 Header 区域 -->
    <mt-header fixed title="新闻快讯">
			 <span  slot="left" @click="goBack" v-show="flag">
    	 <mt-button icon="back">返回</mt-button>
  		 </span>
		</mt-header>

    <!-- 中间的路由 router-view 区域 -->
		<!-- 给路由切换 添加动画 -->
		<transition>
			<router-view></router-view>
		</transition>


   <!-- 底部 Tabbar 区域 -->
    <nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-lib " to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/member">
				<span class="mui-icon mui-icon-contact">
					</span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart">
					<span class="mui-badge" id="badge">0</span>

					<!-- 这里 在main.js getAllCount 方法中 把获取到的 所有添加购物车的件数 在这里输出 -->
					<!-- <span class="mui-badge" id="badge">{{ $store.getters.getAllCount }}</span> -->
				</span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-lib" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
  </div>
</template>

<script>
export default {
	data(){
		return {
			flag : false
		}
	},
	created(){
		this.flag = this.$router.path === './home' ? false : true
	},
	methods:{
		goBack(){
			//点击后退
			this.$router.go(-1)
		}
	},
	watch:{ //监听 URL地址
	 '$route.path':function(newVal){
		 if(newVal === './home'){
			 	this.flag = false
		 }else {
			  this.flag = true
		 }
	 }
	}
}
</script>


<style lang="scss" scoped>
	.mint-header {
		z-index: 999;
	}
  .app-component{
    padding-top: 40px;
		padding-bottom: 50px;
		overflow-x: hidden;
  }


	// 地下 导航条 的路由切换
	.v-enter{
		opacity: 0;
		// 左边进来
		transform: translateX(100%);  
	}
	.v-leave-to{
		opacity: 0;
		// 右边小时
		transform: translateX(-100%);
		position: absolute;
	}

	.v-enter-active,
	.v-leave-active{
		transition: all 0.6s ease;
	}

	.mui-bar-tab .mui-tab-item-lib.mui-active {
    color: #007aff;
}

	.mui-bar-tab .mui-tab-item-lib{
		display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
	}

	.mui-bar-tab .mui-tab-item-lib .mui-icon{
		top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;

	}
	.mui-bar-tab .mui-tab-item-lib .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}
</style>
